CI: Update workflows to enable corner testing against Terraform 1.8.0-rc1

[austinvalle]

I updated both action variables in this repository to include the RC for v1.8.0 so we can test against functions in our CI. This shouldn't impact any of the framework repositories CI as they don't consume the workflow itself, just clones the repo.

Maybe we should update framework to do the same? Or we can wait 😆

TF_VERSIONS_PROTOCOL_V5

["0.12.*","0.13.*","0.14.*","0.15.*","1.0.*","1.1.*","1.2.*","1.3.*","1.4.*","1.5.*","1.6.*", "1.7.*", "1.8.0-rc1"]

TF_VERSIONS_PROTOCOL_V6

["1.0.*","1.1.*","1.2.*","1.3.*","1.4.*","1.5.*","1.6.*","1.7.*", "1.8.0-rc1"]

[austinvalle]

@bflad I updated this PR to the main branch of terraform-plugin-testing to consume: hashicorp/terraform-plugin-testing#316

If we want to update all of our workflows to remove the .* and update our action variable configs to match then I can do that in the upcoming week?

[bflad]

🎉 🎉 🎉

If we want to update all of our workflows to remove the .* and update our action variable configs to match then I can do that in the upcoming week?

That sounds like an excellent plan! It'd be great to push out variable changes (potentially including conditionalizing this repository's variables to add prerelease testing) via Terraform. We could also try to get this done together tomorrow if that's better for you.

[austinvalle]

No worries, I'll work through it next week! Will keep the conditional prerelease testing in mind for that.

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